Is her new boyfriend also to blame for her destructive behavior? Poor Christina needs help.

Christina Aguilera‘s friends are really worried about her — as they should be! After being arrested last month for public drunkenness, and flubbing several major televised performances, the singer is well on her way to hitting rock bottom. “Christina’s lost her confidence since she split from Jordan [Bratman],” a friend tells Starmagazine. “She gets terribly sad, and that’s when all the awful memories [of her troubled childhood] come flooding back and she ends up numbing herself with booze and food.”

Along with her excessive drinking, Christina has also packed on the pounds over the past several months. Friends say she “devours” pizza after binge drinking, which would certainly coincide with doctors’ estimates that Christina is now “40 lbs. overweight.”

Her friends are also worried that Christina’s new man — 25-year-old Matthew Rutler, who was driving the night Christina was arrested —is a bad influence on her. “He is the one taking her out all the time,” a source tells the mag. “Matthew likes the nightlife, and Christina always wants to be with him.”

Christina is believed to be in total denial of all the problems in her life, including the possibility that Jordan will get full custody of their 3-year-old son Max!